1. The present Covenant is open for signature by any State Member of the United Nations or member of any of its specialized agencies, by any State Party to the Statute of the International Court of Justice, and by any other State which has been invited by the General Assembly of the United Nations to become a Party to the present Covenant. 2. The present Covenant is subject to ratification. Instruments of ratification shall be deposited with the Secretary-General of the United Nations. 3. The present Covenant shall be open to accession by any State referred to in paragraph 1 of this article. 4. Accession shall be effected by the deposit of an instrument of accession with the Secretary-General of the United Nations. 5. The Secretary-General of the United Nations shall inform all States which have signed this Covenant or acceded to it of the deposit of each instrument of ratification or accession.